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diff --git a/environments/predictable-placement/custom-hostnames.yaml b/environments/predictable-placement/custom-hostnames.yaml
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+# *******************************************************************
+# This file was created automatically by the sample environment
+# generator. Developers should use `tox -e genconfig` to update it.
+# Users are recommended to make changes to a copy of the file instead
+# of the original, if any customizations are needed.
+# *******************************************************************
+# title: Custom Hostnames
+# description: |
+#   Hostname format for each role
+#   Note %index% is translated into the index of the node, e.g 0/1/2 etc
+#   and %stackname% is replaced with OS::stack_name in the template below.
+#   If you want to use the heat generated names, pass '' (empty string).
+parameter_defaults:
+  # Format for BlockStorage node hostnames Note %index% is translated into the index of the node, e.g 0/1/2 etc and %stackname% is replaced with the stack name e.g overcloud
+  # Type: string
+  BlockStorageHostnameFormat: '%stackname%-blockstorage-%index%'
+
+  # Format for CephStorage node hostnames Note %index% is translated into the index of the node, e.g 0/1/2 etc and %stackname% is replaced with the stack name e.g overcloud
+  # Type: string
+  CephStorageHostnameFormat: '%stackname%-cephstorage-%index%'
+
+  # Format for Compute node hostnames Note %index% is translated into the index of the node, e.g 0/1/2 etc and %stackname% is replaced with the stack name e.g overcloud
+  # Type: string
+  ComputeHostnameFormat: '%stackname%-novacompute-%index%'
+
+  # Format for Controller node hostnames Note %index% is translated into the index of the node, e.g 0/1/2 etc and %stackname% is replaced with the stack name e.g overcloud
+  # Type: string
+  ControllerHostnameFormat: '%stackname%-controller-%index%'
+
+  # Format for ObjectStorage node hostnames Note %index% is translated into the index of the node, e.g 0/1/2 etc and %stackname% is replaced with the stack name e.g overcloud
+  # Type: string
+  ObjectStorageHostnameFormat: '%stackname%-objectstorage-%index%'
+